AltaGas Value Proposition

DMV Population and Demographics Provide Strong Tailwind Population Growth Across WGL Service Territories¹ (2012-2023) Cumulative Customer Additions Across WGL² (2012-2023) 200,000 16% WGL service territories are growing 180,000 WGL has added new 14% 50% 160,000 12% faster than the national 140,000 10% average 120,000 customers at ~1% per year over the past decade 8% I 100,000 6% 80,000 4% 60,000 2% 0% 40,000 VA MD D.C. WGL U.S. National Average 20,000 AltaGas 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023E Customer additions is a foundational core platform growth story 22 22

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